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help with javascript Calculations radio box

Can anyone help me
I trying to do a piece of coding which has two groups of radio button in them one that selects the water system and the time it take and the other one selects which soil type and how many time to water the soil for. I al so have a checked box if there are large plants to be watered which added and extra 1.5 time on
I need to validate also if the radio button have been checked or not.
I am have problems working on the calculation being a newbie at all this JavaScript thing